Speaker Paul D. Ryan, R-Wisc., suggests the March 5 deadline for Congress to act on the Deferred Action for Childhood Arrivals program is flexible but a bill should move in March. (Bill Clark/CQ Roll Call file photo)

Speaker Paul D. Ryan said Wednesday Congress needs to pass legislation replacing the Deferred Action for Childhood Arrivals immigration program by the end of March.

Ryan's imposed deadline for House action comes as the Republican whip team starts to count up votes for an immigration bill (HR 4760) by Judiciary Chairman Robert W. Goodlatte, R-Va., to determine if it has enough support to bring to the floor.

Protesters march up 14th Street past the Washington Monument holding signs during the Women's March on Washington on Saturday. (Bill Clark/CQ Roll Call)

A District of Columbia official estimated a crowd size of more than half a million people for the Women's March on Washington on Saturday, according to the Associated Press. The march, organized to protest the inauguration of President Donald Trump that took place Friday at the Capitol, was originally expected to garner a crowd of 100,000 to 200,000, according to media reports.

Images of long lines at Metro stations filled social media for several hours leading up to the original 1 p.m. ET march start time (though formal speakers and events began at 10 a.m.).